Me 354, Mechanics of Materials Laboratory Stress Concentrations
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چکیده
i) Install the un-notched beam (see Fig. 1) in the four-point flexure loading fixture ii) Attach the load pan (Note: The combined pan/fixture mass is ~0.980 kg) iii) Apply two10-kg masses one at a time to the load pan. iv) With the polarizer and analyzer crossed (dark field), focus the camera, and record the image using the thermal printer v) Determine the maximum fringe orders at the top and bottom of the beam including estimates of fractional fringes orders by counting the fringes. vi) The stress-optical coefficient can be calculated using the following relation:
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